"TfL considers that Uber's approach and conduct demonstrate a lack of corporate responsibility in relation to a number of issues which have potential public safety and security implications," it said in a statement.

Uber said it would appeal the decision, according to Reuters, allowing its car-hailing app to continue operating until the outcome was known.

In London, the firm has faced criticism from unions, lawmakers and traditional black taxi drivers over working conditions. TfL renewed the company's permit to operate in May for a period of four months.

“I want London to be at the forefront of innovation and new technology,” he said in a statement. “However, all companies in London must play by the rules and adhere to the high standards we expect — particularly when it comes to the safety of customers.”

He added: “It would be wrong if TfL continued to license Uber if there is any way that this could pose a threat to Londoners’ safety and security.”